31540434 has 16 divisors (see below), whose sum is σ = 63880320. Its totient is φ = 10380240.

The previous prime is 31540417. The next prime is 31540441. The reversal of 31540434 is 43404513.

It is a super-3 number, since 3×31540434³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32797 + ... + 33744.

It is an arithmetic number, because the mean of its divisors is an integer number (3992520).

Almost surely, 2^31540434 is an apocalyptic number.

31540434 is an abundant number, since it is smaller than the sum of its proper divisors (32339886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31540434 is a wasteful number, since it uses less digits than its factorization.

31540434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66625.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 31540434 is about 5616.0870719746. The cubic root of 31540434 is about 315.9530520971.

Adding to 31540434 its reverse (43404513), we get a palindrome (74944947).

The spelling of 31540434 in words is "thirty-one million, five hundred forty thousand, four hundred thirty-four".